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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"><title>Crypto++: dmac.h Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.5.2 --><div class="tabs"> <ul> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="namespaces.html"><span>Namespaces</span></a></li> <li><a href="classes.html"><span>Classes</span></a></li> <li class="current"><a href="files.html"><span>Files</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="files.html"><span>File List</span></a></li> <li><a href="globals.html"><span>File Members</span></a></li> </ul></div><h1>dmac.h</h1><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#ifndef CRYPTOPP_DMAC_H</span><a name="l00002"></a>00002 <span class="preprocessor"></span><span class="preprocessor">#define CRYPTOPP_DMAC_H</span><a name="l00003"></a>00003 <span class="preprocessor"></span><a name="l00004"></a>00004 <span class="preprocessor">#include "cbcmac.h"</span><a name="l00005"></a>00005 <a name="l00006"></a>00006 NAMESPACE_BEGIN(CryptoPP)<a name="l00007"></a>00007 <a name="l00008"></a>00008 <span class="comment">//! _</span><a name="l00009"></a>00009 <span class="comment"></span>template <class T><a name="l00010"></a><a class="code" href="class_d_m_a_c___base.html">00010</a> class CRYPTOPP_NO_VTABLE <a class="code" href="class_d_m_a_c___base.html" title="_">DMAC_Base</a> : public <a class="code" href="class_same_key_length_as.html" title="support query of key length that's the same as another class">SameKeyLengthAs</a><T>, public <a class="code" href="class_message_authentication_code.html" title="interface for message authentication codes">MessageAuthenticationCode</a><a name="l00011"></a>00011 {<a name="l00012"></a>00012 <span class="keyword">public</span>:<a name="l00013"></a><a class="code" href="class_d_m_a_c___base.html#a351afda43a6f3d3d90debc1e0de89e6">00013</a> <span class="keyword">static</span> std::string StaticAlgorithmName() {<span class="keywordflow">return</span> std::string(<span class="stringliteral">"DMAC("</span>) + T::StaticAlgorithmName() + <span class="stringliteral">")"</span>;}<a name="l00014"></a>00014 <a name="l00015"></a><a class="code" href="class_d_m_a_c___base.html#60f565079392e3fc0de1007453513422">00015</a> CRYPTOPP_CONSTANT(DIGESTSIZE=T::BLOCKSIZE)<a name="l00016"></a>00016 <a name="l00017"></a><a class="code" href="class_d_m_a_c___base.html#e7afea80691cf7b0e507dd64e28d7420">00017</a> <a class="code" href="class_d_m_a_c___base.html" title="_">DMAC_Base</a>() {}<a name="l00018"></a>00018 <a name="l00019"></a>00019 <span class="keywordtype">void</span> UncheckedSetKey(<span class="keyword">const</span> byte *key, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length, <span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html" title="interface for retrieving values given their names">NameValuePairs</a> &params);<a name="l00020"></a>00020 <span class="keywordtype">void</span> Update(<span class="keyword">const</span> byte *input, <span class="keywordtype">size_t</span> length);<a name="l00021"></a>00021 <span class="keywordtype">void</span> TruncatedFinal(byte *mac, <span class="keywordtype">size_t</span> size);<a name="l00022"></a><a class="code" href="class_d_m_a_c___base.html#d472a78f064ead0f9b0d1a39dce1bac9">00022</a> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> DigestSize()<span class="keyword"> const </span>{<span class="keywordflow">return</span> DIGESTSIZE;}<a name="l00023"></a>00023 <a name="l00024"></a>00024 <span class="keyword">private</span>:<a name="l00025"></a>00025 byte *GenerateSubKeys(<span class="keyword">const</span> byte *key, <span class="keywordtype">size_t</span> keylength);<a name="l00026"></a>00026 <a name="l00027"></a>00027 <span class="keywordtype">size_t</span> m_subkeylength;<a name="l00028"></a>00028 <a class="code" href="class_sec_block.html" title="a block of memory allocated using A">SecByteBlock</a> m_subkeys;<a name="l00029"></a>00029 <a class="code" href="class_c_b_c___m_a_c.html" title="CBC-MAC">CBC_MAC<T></a> m_mac1;<a name="l00030"></a>00030 <span class="keyword">typename</span> T::Encryption m_f2;<a name="l00031"></a>00031 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> m_counter;<a name="l00032"></a>00032 };<a name="l00033"></a>00033 <span class="comment"></span><a name="l00034"></a>00034 <span class="comment">//! DMAC</span><a name="l00035"></a>00035 <span class="comment"></span><span class="comment">/*! Based on "CBC MAC for Real-Time Data Sources" by Erez Petrank</span><a name="l00036"></a>00036 <span class="comment"> and Charles Rackoff. T should be a class derived from BlockCipherDocumentation.</span><a name="l00037"></a>00037 <span class="comment">*/</span><a name="l00038"></a>00038 <span class="keyword">template</span> <<span class="keyword">class</span> T><a name="l00039"></a><a class="code" href="class_d_m_a_c.html">00039</a> <span class="keyword">class </span><a class="code" href="class_d_m_a_c.html" title="DMAC.">DMAC</a> : <span class="keyword">public</span> <a class="code" href="class_message_authentication_code_final.html" title="_">MessageAuthenticationCodeFinal</a><DMAC_Base<T> ><a name="l00040"></a>00040 {<a name="l00041"></a>00041 <span class="keyword">public</span>:<a name="l00042"></a><a class="code" href="class_d_m_a_c.html#433de8cfd312830ba42f0ae227c34bef">00042</a> <a class="code" href="class_d_m_a_c.html#433de8cfd312830ba42f0ae227c34bef">DMAC</a>() {}<a name="l00043"></a><a class="code" href="class_d_m_a_c.html#52fac17929c02766ec6d75b2d1bf6521">00043</a> <a class="code" href="class_d_m_a_c.html#433de8cfd312830ba42f0ae227c34bef">DMAC</a>(<span class="keyword">const</span> byte *key, <span class="keywordtype">size_t</span> length=<a class="code" href="class_d_m_a_c___base.html" title="_">DMAC_Base<T>::DEFAULT_KEYLENGTH</a>)<a name="l00044"></a>00044 {this-><a class="code" href="class_simple_keying_interface.html#df3c29b3ef3af74788a58c7c49887fd7" title="set or reset the key of this object">SetKey</a>(key, length);}<a name="l00045"></a>00045 };<a name="l00046"></a>00046 <a name="l00047"></a>00047 <span class="keyword">template</span> <<span class="keyword">class</span> T><a name="l00048"></a><a class="code" href="class_d_m_a_c___base.html#026cf284eb700742dc1dcb4387bd3022">00048</a> <span class="keywordtype">void</span> <a class="code" href="class_d_m_a_c___base.html#026cf284eb700742dc1dcb4387bd3022">DMAC_Base<T>::UncheckedSetKey</a>(<span class="keyword">const</span> byte *key, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> length, <span class="keyword">const</span> <a class="code" href="class_name_value_pairs.html" title="interface for retrieving values given their names">NameValuePairs</a> &params)<a name="l00049"></a>00049 {<a name="l00050"></a>00050 m_subkeylength = T::StaticGetValidKeyLength(T::BLOCKSIZE);<a name="l00051"></a>00051 m_subkeys.<a class="code" href="class_sec_block.html#f9e98d3f4a7af1156fcf3e6e68f4ae5a" title="change size and preserve contents">resize</a>(2*UnsignedMin((<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span>)T::BLOCKSIZE, m_subkeylength));<a name="l00052"></a>00052 m_mac1.SetKey(GenerateSubKeys(key, length), m_subkeylength, params);<a name="l00053"></a>00053 m_f2.SetKey(m_subkeys+m_subkeys.<a class="code" href="class_sec_block.html#f5999bffe3193e62719cc0792b0282a7">size</a>()/2, m_subkeylength, params);<a name="l00054"></a>00054 m_counter = 0;<a name="l00055"></a>00055 m_subkeys.<a class="code" href="class_sec_block.html#f9e98d3f4a7af1156fcf3e6e68f4ae5a" title="change size and preserve contents">resize</a>(0);<a name="l00056"></a>00056 }<a name="l00057"></a>00057 <a name="l00058"></a>00058 <span class="keyword">template</span> <<span class="keyword">class</span> T><a name="l00059"></a><a class="code" href="class_d_m_a_c___base.html#2b03546cff8891451c480c18391d83a5">00059</a> <span class="keywordtype">void</span> <a class="code" href="class_d_m_a_c___base.html#2b03546cff8891451c480c18391d83a5" title="process more input">DMAC_Base<T>::Update</a>(<span class="keyword">const</span> byte *input, <span class="keywordtype">size_t</span> length)<a name="l00060"></a>00060 {<a name="l00061"></a>00061 m_mac1.Update(input, length);<a name="l00062"></a>00062 m_counter = (<span class="keywordtype">unsigned</span> int)((m_counter + length) % T::BLOCKSIZE);<a name="l00063"></a>00063 }<a name="l00064"></a>00064 <a name="l00065"></a>00065 <span class="keyword">template</span> <<span class="keyword">class</span> T><a name="l00066"></a><a class="code" href="class_d_m_a_c___base.html#32251a90087b43d30ea5c4698cd7ecf9">00066</a> <span class="keywordtype">void</span> <a class="code" href="class_d_m_a_c___base.html#32251a90087b43d30ea5c4698cd7ecf9" title="truncated version of Final()">DMAC_Base<T>::TruncatedFinal</a>(byte *mac, <span class="keywordtype">size_t</span> size)<a name="l00067"></a>00067 {<a name="l00068"></a>00068 <a class="code" href="class_hash_transformation.html#64ba03d31c489dc32b50e00d377d8032">ThrowIfInvalidTruncatedSize</a>(size);<a name="l00069"></a>00069 <a name="l00070"></a>00070 byte pad[T::BLOCKSIZE];<a name="l00071"></a>00071 byte padByte = byte(T::BLOCKSIZE-m_counter);<a name="l00072"></a>00072 memset(pad, padByte, padByte);<a name="l00073"></a>00073 m_mac1.Update(pad, padByte);<a name="l00074"></a>00074 m_mac1.TruncatedFinal(mac, size);<a name="l00075"></a>00075 m_f2.ProcessBlock(mac);<a name="l00076"></a>00076 }<a name="l00077"></a>00077 <a name="l00078"></a>00078 <span class="keyword">template</span> <<span class="keyword">class</span> T><a name="l00079"></a>00079 byte *<a class="code" href="class_d_m_a_c___base.html" title="_">DMAC_Base<T>::GenerateSubKeys</a>(<span class="keyword">const</span> byte *key, <span class="keywordtype">size_t</span> keylength)<a name="l00080"></a>00080 {<a name="l00081"></a>00081 <span class="keyword">typename</span> T::Encryption cipher(key, keylength);<a name="l00082"></a>00082 memset(m_subkeys, 0, m_subkeys.<a class="code" href="class_sec_block.html#f5999bffe3193e62719cc0792b0282a7">size</a>());<a name="l00083"></a>00083 cipher.ProcessBlock(m_subkeys);<a name="l00084"></a>00084 m_subkeys[m_subkeys.<a class="code" href="class_sec_block.html#f5999bffe3193e62719cc0792b0282a7">size</a>()/2 + T::BLOCKSIZE - 1] = 1;<a name="l00085"></a>00085 cipher.ProcessBlock(m_subkeys+m_subkeys.<a class="code" href="class_sec_block.html#f5999bffe3193e62719cc0792b0282a7">size</a>()/2);<a name="l00086"></a>00086 <span class="keywordflow">return</span> m_subkeys;<a name="l00087"></a>00087 }<a name="l00088"></a>00088 <a name="l00089"></a>00089 NAMESPACE_END<a name="l00090"></a>00090 <a name="l00091"></a>00091 <span class="preprocessor">#endif</span></pre></div><hr size="1"><address style="text-align: right;"><small>Generated on Fri Jun 1 11:11:20 2007 for Crypto++ by <a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.5.2 </small></address></body></html>⌨️ 快捷键说明
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